Multiple choice general knowledge math & puzzles

COMPLETE THE SERIES 3,7,13,21,31,_.

  1. 41

  2. 42

  3. 43

  4. 44
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The series increases by successive even numbers: 3+4=7, 7+6=13, 13+8=21, 21+10=31. The next increment should be 12, so 31+12=43.

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